Burke faces life in prison if he's convicted of murder in the deaths of his estranged wife, Tracy Burke, and her former mother-in-law, Karen Comer.

Forensic science was the focus of testimony Wednesday.

There were dozens of items that were tested for fingerprints, fluids and DNA, but as each witness testified, none of that evidence directly tied Brent Burke to the victims or the crime scene.

Kentucky State Police fingerprint specialist Fred Crane testified he examined five of six shell casings from the crime scene, a set of keys, and a small plastic bag.

Crane told the court none of these items contained latent fingerprints that could be used for comparison.

More than 50 pieces of evidence from Brent Burke's van and clothing, and evidence from Tracy Burke and Comer were then meticulously itemized for the jury.

KSP forensic science specialist Steven Barrett tested each of them for bodily fluids.

"No blood was found on the gloves, on the child's car seat, on the swab from the boy's bedroom door," he said.

No blood was found on nearly 20 of the items tested. None of the items from Brent Burke's van or his clothing could be linked through DNA to either of the victims.

"I did examine for DNA, but it was insufficient for analysis," Barrett said.

The judge is concerned about how long the trial, which began began Aug. 13., will last. Since then, Thursday was only the 13th day of testimony. By Kentucky law, a person summonsed to jury duty is required to be available for 30 court days. However, once a jury begins hearing a case, the jury will remain seated for the duration of that case.